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Nuclear Theory·nucl-th

Tuesday·May 31, 2016

12 papers—5 primary·7 cross-listed

All12Primary5Cross-lists7
  1. 01

    Light Baryons Mass in a Non-Relativistic Quark Model within an Hypercentral Power Low Potential

    Nasrin Salehi🇮🇷

    In this work, we calculated the baryon mass within a non-relativistically quark model using an approach based on the Gürsey Radicati mass formula (GR). The average energy value of each SU(6) multiplet is described using the SU(6) invariant interaction given by a hypercentral potential. In our series studies we investigate different interactions and situations to gain the best possible model. This goal can be obtained by checking and studying various potentials in different situations. In this paper we present the solution of the Schrödinger equation with an hypercentral power low potential. The results of our model (the combination of our proposed hypercentral Potential and generalized GR mass formula to description of the spectrum) show that the strange and non-strange baryons spectra are in general fairly well reproduced. The overall good description of the mass which we obtain shows that our model can also be used to give a fair description of the energies of the excited multiplets up to three GeV and the position of the Roper resonances of the nucleon.

    nucl-th0 citations
  2. 02

    A combined model for pseudorapidity distributions in Cu-Cu collisions at BNL-RHIC energies

    Zhjin Jiang🇨🇳 · Jie Wang🇨🇳 · Yan Huang🇨🇳

    The charged particles produced in nucleus-nucleus collisions come from leading particles and those frozen out from the hot and dense matter created in collisions. The leading particles are conventionally supposed having Gaussian rapidity distributions normalized to the number of participants. The hot and dense matter is assumed to expand according to the unified hydrodynamics, a hydro model which unifies the features of Landau and Hwa-Bjorken model, and freeze out into charged particles from a space-like hypersurface with a proper time of Tau_FO . The rapidity distribution of this part of charged particles can be derived out analytically. The combined contribution from both leading particles and unified hydrodynamics is then compared against the experimental data performed by BNL-RHIC-PHOBOS Collaboration in different centrality Cu-Cu collisions at sqrt(s_NN)=200 and 62.4 GeV, respectively. The model predictions are in well consistent with experimental measurements.

    nucl-thIJMPE(2016)·2 citations
  3. 03

    Alpha decay as a probe for the structure of neutron-deficient nuclei

    Chong Qi

    The advent of radioactive ion beam facilities and new detector technologies have opened up new possibilities to investigate the radioactive decays of highly unstable nuclei, in particular the proton emission, decay and heavy cluster decays from neutron-deficient (or proton-rich) nuclei around the proton drip line. It turns out that these decay measurements can serve as a unique probe for studying the structure of the nuclei involved. On the theoretical side, the development in nuclear many-body theories and supercomputing facilities have also made it possible to simulate the nuclear clusterization and decays from a microscopic and consistent perspective. In this article we would like to review the current status of these structure and decay studies in heavy nuclei, regarding both experimental and theoretical opportunities. We then discuss in detail the recent progress in our understanding of the nuclear formation probabilities in heavy nuclei and their indication on the underlying nuclear structure.

    nucl-thRev.Phys.(2016)·46 citations
  4. 04

    Odd-even staggering in neutron drip line nuclei

    S.A. Changizi · Chong Qi

    We have done systematic Hartree-Fock-Bogoliubov calculations in coordinate space on the one-quasi-particle energies and binding energy odd-even staggering (OES) in semi-magic nuclei with the zero-range volume, mixed and surface pairing forces in order to explore the influence of their density dependence. The odd- isotopes are calculated within the blocking scheme. The strengths for the pairing forces are determined in two schemes by fitting locally to reproduce pairing gap in Sn and globally to all available data on the OES of semi-magic nuclei with . In the former calculations, there is a noticeable difference between the neutron mean gaps in neutron-rich O, Ca, Ni and Sn isotopes calculated with the surface pairing and those with the mixed and volume pairing. The difference gets much smaller if the globally optimized pairing strengths are employed. The heavier Pb isotopes show the opposite trend. Moreover, large differences between the mean gap and the OES may be expected in both calculations when one goes towards the neutron drip line.

    nucl-thNPA(2016)·10 citations
  5. 05

    Solving the puzzle

    Jacquelyn Noronha-Hostler🇺🇸

    For the past ten years , the nuclear modification factor that encodes the suppression of high particles due to energy loss within the medium was fairly well described by many theoretical models. However, the same models systematically under-predicted the high elliptic flow, , which is experimentally measured as the correlation between soft and hard hadrons. All previous calculations neglected the effect of event-by-event fluctuations of an expanding viscous hydrodynamical background as well as the soft-hard flow harmonic correlations in the experimentally measured . In this talk I show how event-by-event viscous hydrodynamics (computed using the v-USPhydro code) coupled to an energy loss model (BBMG) is able to simultaneously describe soft physics observables as well as the high- and . Suggestions for future more differential calculations at the LHC run2 are made to explore soft-hard flow correlations.

    nucl-thhep-phnucl-exJ.Phys.Conf.Ser.(2016)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE